Electric motor.



No. 643,093. Patented Feb. 6, |900. J. C. HENRY.

ELECTRIC MOTOR.

(Application led Aug. 27, 1892.) (N o M o d e l "LWW www@ mi Ura- @mUEM/2mm UNITED STATES PATENT OFFICE.

JOHN C. HENRY, OF VESTFIELD, NEN JERSEY.

ELECTRIC MOTOR,

SPECIFICATION forming part of Letters Patent No. 643,093, dated February6, 1900.

Application filed August 27, 1892. Serial No. 444,306. (No model.) v

motors with which an electric railway-car isfrequently equipped.

The object of the invention is to enable said motors to be run eitherbipolar or fourpoled in series or in parallel, with the fields in seriesor in parallel and the armatures likewise, as hereinafter more fullyexplained.

In the drawings, Figure l shows the several positions of the switch.Fig. 2 shows the arrangement of the iield and armature windings in thetwo motors. Fig. 3 is a side elevation of one of the motors. Fig. 4 isan end view of the switch.

The pole-pieces A B G Il of the iield-magnets M-Mf are arrangedsymmetrically around the armature N, which has four commutator-brushes CD E F arranged midway between the pole-pieces. The terminals of themagnet M are at ce b and those of the magnet M are at g 7L. The brushesare connected, respectively, with the terminals c d e f.

The switch may be of any suitable construction; but I prefer to use sucha one as is shown in my pending application, Serial No. 368,595,consisting, essentially, of a cylinder carrying contact-pieces to closethe circuit through the several terminals, the contact-pieces beingproperly connected to give the desired direction to the current. Thecontact-pieces are arranged in five groups, sixteen in each group, tocorrespond with the sixteen terminals of the two motors X X. Y Thecontact-pieces are numbered in regular order in the diagram.

First position-Upon reference to Fig. l it will be apparent that thecurrent entering at l passes through a to the coils m 'm2 to b, 2, 8, c,brush C, brush E, e, 5, 7, g, coils m3, m4, h, 8, thence tocontact-piece 9, where it takes a similar course through the motor 3X.In

this position of the switch the upper-poles .A

H of the field-magnets are both of the same polarity, and the lower onesB G of the other polarity, giving a bipolar machine. The horizontalbrushes C E are the only ones in circuit. The field windings andarmatures are in series in each motor, the two motors being also inseries.

Second position-*The current enters at l and passes thence to a, m m2,h, 2, 3. Here it divides, part going through c and brushes C F tof, 6,and the other part going through 5, e, E, D, d, 4, whence it unites withthe current from 6 and passes to 8, h, m4, m3, g, 7, and thence to motorX. The two motors are in series, the veld and armature are fourpoled,and the iields are in series with the armatures.

Thfird position-The circuit through each motor is the same as in thesecond position of the switch; but the motors are in parallel instead ofin series, the current entering at l dividing between l and 9.

Fourth position-I-Iere the fields and armatures are four-poled, themotors are in series,

the individual iields are in series, and the armatures are four-poled inparallel. The current entering at l a goes through m' m2 to b, 2, S,71., m4, m3, g to 7, where it divides, part going to 5, where it dividesthrough e, E, D, d, 4 and through 3, c, C, E, f, '6 and then unites andgoes to 9. currentv from 7 goes to 11, where it divides through c C, F,f, 14, to 9 and throughl, e, E, D, d, l2, to 9. Here it unites with thecurrent from 4 and 6 and the entire current goes through the coils m','m2, m4, m3 and out at 15.

Fifth position-Here the four field-magnets in the two motors are inparallel, the armatures, which are four-poled, being also in parallel.The current divides between l, S, 9, and 16, each portion going throughtwo field-magnet coils and then through two adjacent brushes of thecommutator to a common return.

It is obvious that the invention is not limited to the special form offour-poled motor shown in the drawings, since it is readily applicableto other forms of multipolar machines. The switch is capable of varioussimple modifications,so as to provide,forinstance, for cutting outeither of the motors or reversing the current through the iields or ar-The other part of theA mature. Moreover, by further mechanical 2. Thecombination With two electric mochange in the switch the vinvention maybe applied to motors having any number of polepieces.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination with two electric motors each having pairs ofpole-pieces of a switch arranged to connect said motors in series or inparallel and to alter them from bipolar to four-poled, or vice versa',substantially as described.

tors each having four pole-pieces and four commutator-brushes of aswitch arranged to connect said motors in series or in parallel and toalter them from bipolar to four-poled, or vice versa, substantially asdescribed.

In Witness whereof I have hereunto set my hand this 23d day of August,1892.

JOHN C. HENRY. Witnesses:

JOHN M. C. MARSH, WM. W. GILBY.

